Using only the English, but frequently since I have no Internet at home, I can say this is a worthwhile compilation of WikiPedia.
Not an expert in the finer points, I was disappointed at first because the pages lacked the hyperlinked, footnoted references, one of the strengths of Wikipedia. However, I learned that (if you are online) for any given page in Wikipedia, under the “Article” menu, you can choose “Update Article," and it will refresh the page with current content (any additions/deletions to the text, along with hyperlinked footnotes, and illustrations). Concerning the illustrations, it opens them up in a simple editing interface (for zooming, rotation, full-screening, and searching). But it’s the footnotes that I value most. At the moment, the only way I know to access the external links is to copy the link and paste it into a browser (but I admit I haven’t researched this).
On the negative side (and this is minor) the left-hand navigation pane is a bit clumsy. Instead of clicking on “History” for example, one must hover over the “History” line and click to “Show” to the right. Minor. In the end, for people like me who are both offline and think Wikipedia one of the best products of the Internet, this is worth purchasing and using.